In a lab in Pontedera, Italy, tiny tubes just 500 nanometers wide—about as wide as a virus—are doing something never seen before: they heat up when hit with light, release a brain chemical when zapped with sound, and generate electricity all on their own. These microscopic nanotubes, shaped from a form of dopamine, are the first single material to combine three powerful abilities: turning light into heat, responding to ultrasound with electrical pulses, and releasing antioxidant molecules. Led by scientist Gianni Ciofani at the Italian Institute of Technology (IIT), the team created these nanotubes not just to push science forward—but to one day help treat cancer and diseases like Parkinson’s.
Most medicines do one thing at a time. But these nanotubes are built to multitask. When infrared light shines on them, they warm up—heat that could be used to kill cancer cells without harming nearby tissue. When ultrasound waves hit them, they vibrate and produce a tiny electric current, like a wireless pacemaker for nerve cells. That could help guide brain activity in people with neurological disorders. And all the while, they slowly release dopamine, the same chemical our brains use to signal reward and movement—offering both an antioxidant boost and a potential way to replace what’s lost in brain diseases.
The secret is in their shape. While dopamine is usually studied as a small molecule or clumped into round particles, Ciofani’s team shaped it into hollow tubes. That change unlocked a rare power: piezoelectricity. It’s a trait usually found in crystals like quartz, where pressure creates electricity. Now, for the first time, it’s been seen in a soft, biocompatible organic material. "Piezoelectricity had never previously been observed in polydopamine: The tubular shape allowed a property that is absent in spherical nanoparticles made from the same material to emerge," says Ciofani. The tubes are about one-seventieth the length of a grain of sand and 500 times thinner than a human hair—small enough to move through the body, yet powerful enough to interact with cells.
So far, the team has tested the nanotubes on cells in dishes, confirming they’re not toxic and can influence cell behavior. They’ve also shown the particles respond reliably to both light and sound. The next step? Testing them in animals, and eventually, people. If all goes well, these tiny tubes could become a new kind of smart medicine—one that doctors control from outside the body using harmless beams of light and sound.
"The nanotubes release dopamine in a controlled manner and respond to external stimuli such as ultrasound and infrared light, integrating multiple functions into a single platform," says Matteo Battaglini, the study’s first author. In a world where treatments often come with harsh side effects, this tiny invention offers a gentler vision: medicine that’s precise, responsive, and in tune with the body’s own rhythms.